<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
		<img src="small.jpg" data-src = "big.jpg"  />
		
		<script>
			window.onload = function(){
				
			}
		</script>
	</body>
</html>

 